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/**
* Tests that modding the smallest representable integer values by -1 does not result in integer
* overflow. Exercises the fix for SERVER-43699.
*/
(function() {
"use strict";
const testDB = db.getSiblingDB(jsTestName());
const testColl = testDB.test;
testColl.drop();
// Insert two documents, one with a value of -2^63 and the other with a value of -2^31.
const insertedDocs = [
{_id: 0, val: NumberLong("-9223372036854775808")},
{_id: 1, val: NumberInt("-2147483648")}
];
assert.writeOK(testColl.insert(insertedDocs));
// For each possible integral representation of -1, confirm that overflow does not occur.
for (let divisor of[-1.0, NumberInt("-1"), NumberLong("-1"), NumberDecimal("-1")]) {
try {
assert.docEq(testColl.find({val: {$mod: [divisor, 0]}}).sort({_id: 1}).toArray(),
insertedDocs);
assert.docEq(testColl
.aggregate([
{$match: {$expr: {$eq: [0, {$mod: ["$val", divisor]}]}}},
{$sort: {_id: 1}}
])
.toArray(),
insertedDocs);
// Confirm that overflow does not occur during agg expression evaluation. Also confirm
// that the correct type is returned for each combination of input types.
const expectedResults = [
Object.merge(insertedDocs[0], {
modVal:
(divisor instanceof NumberDecimal ? NumberDecimal("-0") : NumberLong("0"))
}),
Object.merge(insertedDocs[1], {
modVal: (divisor instanceof NumberLong
? NumberLong("0")
: divisor instanceof NumberDecimal ? NumberDecimal("-0") : 0)
})
];
assert.docEq(testColl
.aggregate([
{$project: {val: 1, modVal: {$mod: ["$val", divisor]}}},
{$sort: {_id: 1}}
])
.toArray(),
expectedResults);
} catch (error) {
jsTestLog("Failure encountered on divisor: " + tojson(divisor));
jsTestLog("Explain output for find with $mod match expression: " +
tojson(testColl.find({val: {$mod: [divisor, 0]}}).sort({_id: 1}).explain()));
jsTestLog("Explain output for aggregate with $mod aggregation expression in $expr: " +
tojson(testColl.explain().aggregate([
{$match: {$expr: {$eq: [0, {$mod: ["$val", divisor]}]}}},
{$sort: {_id: 1}}
])));
jsTestLog(
"Explain output for aggregate with $mod aggregation expression in $project: " +
tojson(testColl.explain().aggregate(
[{$project: {val: 1, modVal: {$mod: ["$val", divisor]}}}, {$sort: {_id: 1}}])));
throw error;
}
}
})();
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